MIP with Purge and Trap:

Analytical sampling with MIP can be enhanced by incorporating a second component to include a gas chromatograph for separation, identification, and quantification.  Prior to the MIP carrier gas line entering the PID/ECD detectors, a valve is used to split the carrier gas with half going to the detectors and half going into a trap containing Tenax material.  The trap sorbs VOCs which effectively concentrates the contaminates.  Changing the trap at known intervals and for set times allows a more complete analysis to be accomplished by thermally desorbing the VOCs directly into the gas chromatograph.  This new approach to direct vapor sensing significantly increases system sensitivity and provides more information for the identification of VOCs.

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